Q: In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Passage: Roxas' first appearances were cameos in Another Side, Another Story, a bonus trailer found in Kingdom Hearts, and in the ending of . In Kingdom Hearts II, Roxas is introduced as a boy living in a computer simulation of a city called Twilight Town. Unaware of the virtual nature of the city, Roxas begins to dream about the adventures of Sora, the series' protagonist. He later encounters Axel, a member of Organization XIII who is under orders to extract him, and Naminé, a Nobody who tells him he is Sora's other half. Shortly after meeting DiZ, the creator of the virtual world, Roxas learns the true nature of Twilight Town, and that DiZ altered his memory and personality to mislead his pursuers from the Organization until he can merge with Sora. DiZ leads Roxas to an old mansion where he rejoins a sleeping Sora, allowing him to wake up. Sora later learns that Roxas is his Nobody, created during the events of the first game after briefly turning into a Heartless, and inducted into the Organization for his ability to capture hearts with the Keyblade; however, Roxas later betrayed the Organization and encountered one of Sora's friends, Riku, who captured him to restore Sora. Roxas makes two appearances near the end of the game: the first is in a mental battle with Sora depicted as a cut-scene, and the second is with Naminé, who has merged with her other self, Kairi. In the re-released version of the title, Kingdom Hearts II Final Mix, Roxas' fight against Sora is expanded, making him a boss character. The battle was meant to be interactive in Kingdom Hearts II, but time constraints imposed from creating fights for the other Organization XIII members prevented its inclusion. With the opportunity to include the fight, Nomura's team worked hard to make it entertaining for players. Additional scenes about Roxas' past were included in the game to add to the mystery around him.
 Link Information: Roxas' fight against Sora is expanded, making him a boss character. Question: What qualified Roxas to be a boss character?
A:
Answer: Roxas' fight against Sora